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What makes an electromagnet stronger than a solenoid?

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An Op-amp as a voltage follower has a voltage gain of

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An Op-amp as a voltage follower has a voltage gain of Unity

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0 answers 70 views

An op-amp having a slew rate of 62.8 V/msec, is connected in a voltage follower configuration. If the maximum amplitude of the sinusoidal input is 10 V, then the minimum frequency at which the slew rate limited distortion would set in at the output is  (A) 1 MHz (B) 6.28 MHz (C) 10 MHz (D) 62.8 MHz

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 29 views

An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop gain is (a) 1 (b) 1,00,000 (c) 50 (d) 0.02

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

An OP-AMP can be classified as  1.Linear amplifier 2.Low - Rin amplifier 3.Positive - feedback amplifier 4.RC - coupled amplifier 

asked May 13, 2018 in Amplifier by Shimroz123
0 answers 52 views

A dominant pole compensated op-amp has openloop gain of 100 dB and -3 dB bandwidth of 50 Hz. If it is connected as inverting amplifier for a gain of 20 dB the -3 dB bandwidth is about  A) 500 kHz B) 50 kHz C) 5 kHz D) 500 Hz

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
1 answer 25 views

An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

asked May 29, 2018 in Amplifier by Shimroz123
1 answer 8 views

The input impedance of an op-amp is • High • Low • Medium • None of the above

asked May 14, 2018 in Amplifier by Shimroz123
1 answer 19 views

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the input is connected to inverting or non -inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
0 answers 15 views

What is the gain of an op amp?

asked Mar 10, 2018 in Analog electronics circuits by Quiz
1 answer 34 views

An OP amp has a slew rate of 1V/µs. At a signal frequency of 0.1 MHz, the maximum undistorted sine wave amplitude is (a) 8V (b) 4.82 V (c) 2.02 V (d) 1.592 V

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

Identify type of BJT configuration having following features : (i) BJT configuration having the least current gain. (ii) KIT configuration called as voltage follower. (iii) BJT configuration having current gain less than one. (iv) BJT configuration suitable for impedance matching. (v) BIT configuration suitable for voltage amplification. (vi) BJT configuration having the least output impedance.  

asked Jul 10 in Elements of Electronics by Shimroz123
1 answer 22 views

 In an electronic ohmmeter an op -amp is used as a: -  a) sommer b) multiplier c) buffer amplifier d) integrator

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
1 answer 15 views

The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : -  a) 5V/µs b) 2.5 V/ µs c) 3V/µs d) 4.5V/ µs

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
1 answer 28 views

An amplifier without feedback has a gain of 1000. The gain with a negative feedback of 0.009 is  A) 10 B) 100 C) 125 D) 900

asked May 20, 2018 in Amplifier by Shimroz123
0 answers 9 views

An ideal Op Amp has  (a) infinite input and output impedance (b) very low input and output impedance (c) low input impedance and very high output impedance (d) infinite input impedance and zero output impedance

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 11 views

An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

asked May 20, 2018 in Amplifier by Shimroz123
1 answer 11 views

In op-amp operation, Common Mode Rejection Ratio (CMRR)

asked May 12, 2018 in Amplifier by Shimroz123
0 answers 16 views

Output of an op-amp is a square wave of 4 V peak to peak with a rise time of 5 microsecond and fall time of 4 microsecond.Maximum frequency (in kHz)of undistorted sine wave output of 2 V peak to peak is about  A) 100 B) 150 C) 200 D) 250

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 34 views

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is  (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

asked May 1, 2018 in Power Electronics by Shimroz123
1 answer 12 views

An amplifier has a voltage gain of 50; this gain in dB will be (A) 34 dB (B) 68 dB (C) 41 dB (D) 14 dB 

asked Apr 23, 2018 in Instrumentation and control by Shimroz123
0 answers 33 views

What is the Output voltage of Op-amp for input voltage of Vi1=150 μV,Vi2=140 μV if the amplifier has differential gain of Ad=4000 and value of CMRR is 100. 

asked Apr 4, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

The voltage gain of a common base amplifier depends on  1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above 

asked May 13, 2018 in Amplifier by Shimroz123
1 answer 3 views

State any two characteristics of an ideal Op-amp.

asked Sep 13, 2018 by Shimroz123
0 answers 14 views

An op-amp can be represented by  A) Norator at input and Nullator at output B) Norator at output and Nullator at input C) Norator at input and output D) Nullator at input and output

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 12 views
1 answer 81 views
1 answer 26 views

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

asked Jun 18, 2018 in Amplifier by Shimroz123
1 answer 15 views

The gain of an FET amplifier can be changed by changing: (1) rm (2) gm (3) Rd (4) None of these

asked May 28, 2018 in Amplifier by Shimroz123
1 answer 34 views

If the feedback factor of an amplifier is 0.1 and its gain without feedback is 40, then its gain with feedback is (a) – 13.3 (b) 200 (c) 8 (d) 10 

asked May 25, 2018 in Amplifier by Shimroz123
1 answer 24 views

The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is  (A) The active device itself (tube, or transistor)  (B) stray shunt capacitance Cs  (C) the grid leak resistance Rg  (D) coupling capacitor Cc

asked May 12, 2018 in Amplifier by Shimroz123
1 answer 27 views

A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is

asked May 23, 2018 in Amplifier by Shimroz123
1 answer 13 views

A certain common-emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed.  a. The circuit will become unstable b. The voltage gain will decrease  c. The voltage gain will increase d. The circuit will become stable

asked Aug 31, 2018 by Shimroz123
1 answer 14 views

Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will   (A) Amplify the noise as much as the signal (B) Reduce the noise (C) Increase the noise (D) Not effect the noise

asked May 17, 2018 in Amplifier by Shimroz123
1 answer 23 views

The current gain of emitter follower is: A) less than one B) more than one C) zero D) unpredictable

asked Jun 4, 2018 in Power Electronics by Shimroz123
1 answer 10 views

Just as a voltage amplifier signal voltage a power amplifier.  1.amplifier power  2.amplifier signal  3.converts the signal ac power into DC power  4.converts a dc power into useful AC power 

asked May 13, 2018 in Amplifier by Shimroz123
0 answers 39 views

An amplifier which has almost same gain and input resistance of a CE amplifier but of higher bandwidth is  A) Cascode amplifier B) Cascade amplifier C) Darligton amplfier D) CC amplifier

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 31 views

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 20 views

Draw the diagram of zero crossing detector using op-amp and explain its working.

asked Sep 12, 2018 by Shimroz123
1 answer 67 views

An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be

asked May 3, 2018 in Power Electronics by Shimroz123
1 answer 3 views

Define the following terms related to Op-Amp: i) CMRR ii) SVRR

asked Sep 13, 2018 by Shimroz123
1 answer 5 views

Draw and explain the Op-amp based subtractor

asked Sep 12, 2018 by Shimroz123
0 answers 14 views

The type number CA3741 operational amplifier(op-amp) is manufactured by  A) RCA B) Texas instruments C) Signetics D) Motorola

asked Apr 5, 2018 in Electronics Engineering by Shimroz123
0 answers 388 views

What is op amp and its application?

asked Mar 10, 2018 in Analog electronics circuits by Quiz
1 answer 21 views

For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

asked May 23, 2018 in Amplifier by Shimroz123
1 answer 25 views

A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at  (A) 50.0% of the rated current (B) 64.0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current

asked May 17, 2018 in Transformer by Shimroz123
1 answer 27 views

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 15 views

An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C

asked May 23, 2018 in Amplifier by Shimroz123

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